ukbajadave

Welcome to the world of tomorrow! Mirrorless Mercedes Actros

In a word no I think when you drive the yellow input both diff outputs (black axle, red axle) turn in the same direction. When you turn the red axle the black wants to rotate in the opposite direction? I'm not even sure it isn't some weird friction type thing. If someone else wants to build and confirm it works (or doesn't?) My instinct is that a worm gear solution exists but I haven't found it yet.

First attempt, Yellow is input, red is output. Turning yellow axle turns red axle freely. Forcing red axle results in skipping teeth between differential and tan 20z.

I like it when I have something to occupy my mind So: One input and one output. Should not allow backdriving. Any gearing up/down needed? Does input/output need to rotate in both directions? How much torque? (Would a linear clutch on the output be sufficient?)

@Kris_theCat Welcome to Eurobricks If you click a the username at the top of a post it takes you to their profile page where you can see Pepa Quin has not been on the forum since 2018 and this thread is from 2015. It may be they have taken a break from Lego and won't see your reply. Why not challenge yourself to recreate the model digitally using something like Lego Digital Designer or Stud.io? The top half looks fairly easy with obvious connections, the tracked section is trickier but I'm sure you could figure out something that looks right even if you come at it from a different angle.

The Cobra is a fine looking model in itself. The fact that you made it out of a Mustang in one week is even more impressive. Well done

Buy this set!! One of my all time favourite builds, great playability, good parts pack and great for mods too I dont own any PU but I believe the motor and hub are both larger. The motor only by one or two studs but the hub is sizeable. If you look at my pics you'll see I had to move the switches slightly to make room so it might be a squeeze. Maybe consider putting the motor and pump or hub in the chassis? Once again, GREAT set! Don't miss out on it just because PU might not fit.

Thanks, that will make it simpler This all started when I tried to motorise 42077 B model. Nice and easy to swap the fake motor for a L or XL but it barely moved after I geared it up loads. So then I stripped it down to a chassis and it was only a little better. Now I've started from scratch with 2 L motors and it is still sloooow. I'm going to look foolish if it's just flat batteries...

Opinions required please. I'm trying to make a fast(ish) car using only PF, no Buwizz or sbrick. Is there any advantage to coupling motors like this rather than hard coupling with 24z gears? Also, am I simply barking up the wrong tree with 2 L motors and gearing up? Will there be enough torque to actually move stuff?

Interesting that these crazy times meant I suddenly found myself almost adrift. Thank goodness someone had the idea to organise a competition I felt I could enter to give me a focus I've already said that I think a small size limit encouraged people to enter and it seems a lot of entries were from new members who will hopefully continue to contribute to the forum as a whole. This was a great experience for me, thanks to Jim for organising it, and thanks to everyone who entered or commented

So so much going on in this. How many servo motors do you have?! In fact how many motors total? I could go through and count myself but it would take a while... I'm a sucker for functions and this seems to have them all, I really like the novel idea of a Lego airbag. Whilst not actually a function the minifig hands for speedo needles is a nice touch. I'm interested in your build process. Did you do any prior planning digitally or just build? Was the body shape limited by existing functions or part availability? Whilst the turning headlights are great maybe sacrificing one small feature would have allowed a large change in shaping. Finally when photographing MOCs try putting your phone on a 2 second timer to reduce shake.

Pretty close but my bath table has a holder for both a phone and a tablet already (and a wine glass. I love my bath table ) Lego for me is a way to relax and shift focus, especially building MOCs so that was one purpose. I tried to learn some video editing skills this time around so that was another purpose... but mainly like many I've had to get used to video calling my family instead of visiting. I got annoyed with propping my phone on the salt shaker only for it to fall down halfway through a call so built this. Also it's nice not having to stretch your arm to fit everyone in. And the lights are for when it is dark of course. Thank you all for looking and commenting, I hope its final purpose was to bring you a little amusement :)

If nothing else I am slightly envious of your parts collection. So 15 worm gears and a half bush leaves 1 stud at each end for mounting :)

I assume you mean a model which demonstrates the functions as opposed to a functional model Is the leadscrew the long screw on which the carriage moves? I think worm gears would work for this. Without knowing your scale would a 32L axle be long enough? Does anyone have a 32L axle and 16 worm gears handy? I suspect the total slack would still not equal a convenient half bush...

That's a cool little video. That is kind of what I had in mind using axles and cross connectors. I tried to make something with what I have but the limiting factor was needing a single axle. Looking on bricklink I see the longest axle is 32L so some kind of crane boom should be possible. I wonder if the additive slack over that length would equal a half bush?

But I never stated it was 8L? In fact I I specifically stated they are less than 2L However, the fact remains if you line the dots up they match perfectly. (Out of system but still...)

If you've ever used Lego bricks to hold some wires down as you solder or made a wedge for a flapping window frame you'll know it's a versatile product. That's how this started, a simple problem that I thought I could quickly sort with Technic. Then I thought "Why not adjustable?" Then "Why not Powered?" Then "Why not RC?" This monster is the result. 4 motors, 2 IR receivers and lights. 1 M motor drives the top arm, 1 M motor drives the side gear racks and 1 L motor drives the bottom mount. The bottom mount is sprung to provide a little give and the rubber beams add protection and grip. PF lights are driven by a servo motor and underneath non slip Technic tread rubbers provide a stable base. The red mushroom is to reach the buried battery box. This all works exactly as intended. Although I could have probably achieved the same goal with 20 pieces where's the fun in that?

The worm gears are super sensitive to orientation on the axle. The yellow bushed axle is all lined up correctly. The grey bushed axle has 2 gears 90° out , leading to the slight variation in pitch. The 2L worm gear has a single dotted line on it to help with alignment just like the slots in universal joints. I'm not an engineer but I believe the reason 2L gears are not actually 2L is because the pitch is defined by the existing spur gears. If they were a fraction longer for the same pitch they wouldn't line up at the joins. That's also why the 1L worm gears dont line up, there is not enough room in 1 stud to fit 3 rotations at a fixed pitch. I only physically have one of the 1L gears to play with but I did notice it also appears to have more friction on the axle than the longer ones.

Mmm, worm gear trivia. I believe it's also the case that when building for example a brick built linear actuator the old worm gears match up in a line but the new ones don't.

Nice work telling the story behind the VW Gremlin. Any car aimed at teenagers should have front seats that fold down flat The black 1/2 beam as door furniture is a lovely detail.

At any cost you must keep the hot dogs

Loving the "headrests"

Like @Jerac this was the only car worthy of going on my bedroom wall in the 80s. I'm a big fan of virtual pivot steering and yours looks like a method I haven't seen before where the endpoints of the steering arms do not pivot on the chassis. It's hard to see how it works from the short clip. I'm not really one for display models but this tempts me, are there any super rare parts in this build and can you do different colours?

A great build made better with a fun story to go with it. It was interesting to read the link to the real thing as I didn't know they existed (perhaps that's the point) The 1x2 bricks with groove under the windows look good and the bartop hatch is a nice detail. The only thing missing is the second phone box leading to a proper pub with a dartboard to escape the craft cocktail drinking hipsters

Looking forward to seeing this in the correct colours and all stickered up The small scale of this contest seems to drive creativity, your front hubs with both drive and steering are ingenious and rear beam suspension is different. Do the flex axles provide enough spring? It looks like a light model. Stacked beam doors, roof, all 4 wings, I see enough technic in this to keep me happy. Post it up and let the voters decide!